1974 Turkish curiosity is a bargain-basement, shot-for-shot remake of William Friedkin's The Exorcist (1973), notable chiefly for its shoddy special effects and plagiarized soundtrack (Mike Oldfield's Tubular Bells, badly recorded from the original film.) During the 1970s, Turkish filmmakers brazenly ripped off dozens of popular American movies, such as Dirty Harry, Death Wish, Superman, etc., in some cases even using clips from the original films in their low-budget, Turkish-language remakes. The most notorious example of this is The Man Who Saved The World (also known as the Turkish Star Wars), which contained numerous, badly back-projected clips of George Lucas's original Star Wars. Most of these films were released without any form of registration or copyright notification. Many have since been lost; since the negatives were typically recycled for the silver content, they will likely remain so.
In Seytan, the Fr. Karras character is a psychologist, not a Jesuit priest, and the elderly Fr. Merrin is replaced by an Islamic cleric. Other than that, the plot and action is identical. The film is in the original Turkish, with no English subtitles. But really, who needs them?